feat(phase1): rebrand to TTRPG Player and drop Git updates feed

Rename product to TTRPG Player (TTRPGPlayer / com.ttrpgplayer.app), use .ttrpg.zip for new saves while keeping .dnd.zip import, accept TTRPG- and DND- license keys on client, and remove sync-update-feed plus CI push to DndGamePlayerUpdates.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/release-win-prep.mjs

@@ -17,7 +17,7 @@ function sleep(ms) {
 function tryKillDndPlayer() {
   if (process.platform !== 'win32') return;
   try {
-    execFileSync('taskkill', ['/F', '/IM', 'DNDGamePlayer.exe', '/T'], {
+    execFileSync('taskkill', ['/F', '/IM', 'TTRPGPlayer.exe', '/T'], {
       stdio: 'ignore',
       windowsHide: true,
     });
@@ -37,7 +37,7 @@ async function tryRmWinUnpacked() {
     }
   }
   console.warn(
-    '[release-win-prep] Не удалось удалить release/win-unpacked. Закройте DNDGamePlayer и повторите pack.',
+    '[release-win-prep] Не удалось удалить release/win-unpacked. Закройте TTRPGPlayer и повторите pack.',
   );
 }